[dsch] fix for toBe method

src/engine/to-be.ts

@@ -3,6 +3,23 @@ import { Predicate } from '../rules';
 import { throwTypeError } from './throw-type-error';
 import { CasterFn, Guard } from './types';
 
+const spy = <Args extends any[], R>(fn: (...args: Args) => R) => {
+  let isCalled: boolean = false;
+  const result = (...args: Args) => {
+    isCalled = true;
+    return fn(...args);
+  };
+
+  Object.defineProperty(result, 'isCalled', {
+    get: () => isCalled,
+  });
+
+  return result as {
+    (...args: Args): R;
+    isCalled: boolean;
+  };
+};
+
 export const toBe =
   <T, S extends T>(
     casterFn: CasterFn<T>,
@@ -11,7 +28,11 @@ export const toBe =
   ) =>
       withName(
         (value, context, reportError = throwTypeError) => {
-          const typedValue = casterFn(value, context, reportError);
+          const spyReportError = spy(reportError);
+          const typedValue = casterFn(value, context, spyReportError);
+
+          if (spyReportError.isCalled) return typedValue;
+
           if (!predicate(typedValue)) {
             reportError(`${typeName} expected${context ? ` in ${context}` : ''} but "${value}" received.`, context);
             return undefined as any as never;